[swift2objc] Print arbitrary class metatypes as "SWIFT_METATYPE(MyClass)"
[swift2objc] Print arbitrary class metatypes as "SWIFT_METATYPE(MyClass)"

...and then define SWIFT_METATYPE(X) as a macro for "Class", because
Objective-C doesn't have a way to constrain class types to a certain
hierarchy.

With this change, we should handle every type that makes it through the
@objc validator today.

Swift SVN r12190

huonw/swift,cbrentharris/swift,brentdax/swift,therealbnut/swift,Ivacker/swift,russbishop/swift,swiftix/swift,OscarSwanros/swift,practicalswift/swift,gottesmm/swift,amraboelela/swift,CodaFi/swift,kstaring/swift,gregomni/swift,khizkhiz/swift,sschiau/swift,roambotics/swift,frootloops/swift,sdulal/swift,deyton/swift,OscarSwanros/swift,mightydeveloper/swift,kusl/swift,russbishop/swift,slavapestov/swift,adrfer/swift,milseman/swift,Jnosh/swift,kusl/swift,uasys/swift,bitjammer/swift,gmilos/swift,emilstahl/swift,devincoughlin/swift,Ivacker/swift,ahoppen/swift,devincoughlin/swift,atrick/swift,sdulal/swift,natecook1000/swift,ben-ng/swift,OscarSwanros/swift,lorentey/swift,zisko/swift,swiftix/swift,xwu/swift,tinysun212/swift-windows,jopamer/swift,khizkhiz/swift,emilstahl/swift,atrick/swift,felix91gr/swift,hughbe/swift,gottesmm/swift,russbishop/swift,LeoShimonaka/swift,deyton/swift,ken0nek/swift,therealbnut/swift,manavgabhawala/swift,IngmarStein/swift,adrfer/swift,glessard/swift,natecook1000/swift,devincoughlin/swift,swiftix/swift,ahoppen/swift,shahmishal/swift,KrishMunot/swift,JGiola/swift,huonw/swift,allevato/swift,devincoughlin/swift,harlanhaskins/swift,codestergit/swift,devincoughlin/swift,khizkhiz/swift,danielmartin/swift,hughbe/swift,gmilos/swift,stephentyrone/swift,djwbrown/swift,huonw/swift,modocache/swift,johnno1962d/swift,tkremenek/swift,nathawes/swift,kstaring/swift,SwiftAndroid/swift,huonw/swift,Jnosh/swift,djwbrown/swift,deyton/swift,gribozavr/swift,kstaring/swift,swiftix/swift.old,alblue/swift,dduan/swift,glessard/swift,emilstahl/swift,frootloops/swift,manavgabhawala/swift,manavgabhawala/swift,benlangmuir/swift,rudkx/swift,KrishMunot/swift,tinysun212/swift-windows,shahmishal/swift,xedin/swift,xedin/swift,danielmartin/swift,ben-ng/swift,calebd/swift,hooman/swift,slavapestov/swift,jmgc/swift,sdulal/swift,ken0nek/swift,deyton/swift,kentya6/swift,modocache/swift,LeoShimonaka/swift,return/swift,airspeedswift/swift,jckarter/swift,slavapestov/swift,allevato/swift,kusl/swift,apple/swift,JaSpa/swift,johnno1962d/swift,tinysun212/swift-windows,zisko/swift,tkremenek/swift,arvedviehweger/swift,tardieu/swift,MukeshKumarS/Swift,Jnosh/swift,JaSpa/swift,mightydeveloper/swift,khizkhiz/swift,alblue/swift,harlanhaskins/swift,milseman/swift,adrfer/swift,airspeedswift/swift,calebd/swift,calebd/swift,xedin/swift,glessard/swift,jopamer/swift,modocache/swift,natecook1000/swift,shahmishal/swift,xwu/swift,mightydeveloper/swift,amraboelela/swift,felix91gr/swift,mightydeveloper/swift,milseman/swift,russbishop/swift,austinzheng/swift,cbrentharris/swift,IngmarStein/swift,hughbe/swift,jckarter/swift,SwiftAndroid/swift,parkera/swift,bitjammer/swift,KrishMunot/swift,mightydeveloper/swift,xwu/swift,benlangmuir/swift,benlangmuir/swift,modocache/swift,hughbe/swift,hooman/swift,stephentyrone/swift,ken0nek/swift,airspeedswift/swift,return/swift,shajrawi/swift,gregomni/swift,aschwaighofer/swift,tjw/swift,manavgabhawala/swift,kperryua/swift,swiftix/swift,uasys/swift,LeoShimonaka/swift,brentdax/swift,tkremenek/swift,sschiau/swift,tjw/swift,tardieu/swift,khizkhiz/swift,Ivacker/swift,codestergit/swift,jmgc/swift,jckarter/swift,tjw/swift,therealbnut/swift,kstaring/swift,felix91gr/swift,felix91gr/swift,roambotics/swift,aschwaighofer/swift,LeoShimonaka/swift,manavgabhawala/swift,devincoughlin/swift,tinysun212/swift-windows,bitjammer/swift,kentya6/swift,karwa/swift,xedin/swift,modocache/swift,cbrentharris/swift,danielmartin/swift,stephentyrone/swift,adrfer/swift,aschwaighofer/swift,apple/swift,tjw/swift,jopamer/swift,kentya6/swift,kusl/swift,kentya6/swift,xedin/swift,apple/swift,djwbrown/swift,allevato/swift,Jnosh/swift,OscarSwanros/swift,zisko/swift,alblue/swift,manavgabhawala/swift,allevato/swift,gregomni/swift,ahoppen/swift,kentya6/swift,felix91gr/swift,nathawes/swift,codestergit/swift,nathawes/swift,shajrawi/swift,KrishMunot/swift,sdulal/swift,djwbrown/swift,IngmarStein/swift,glessard/swift,atrick/swift,arvedviehweger/swift,practicalswift/swift,jopamer/swift,dduan/swift,allevato/swift,shahmishal/swift,kentya6/swift,practicalswift/swift,OscarSwanros/swift,slavapestov/swift,swiftix/swift.old,shajrawi/swift,karwa/swift,djwbrown/swift,Ivacker/swift,JGiola/swift,jckarter/swift,JGiola/swift,swiftix/swift.old,xedin/swift,airspeedswift/swift,cbrentharris/swift,JaSpa/swift,arvedviehweger/swift,JGiola/swift,sschiau/swift,kperryua/swift,djwbrown/swift,gmilos/swift,brentdax/swift,parkera/swift,practicalswift/swift,sdulal/swift,austinzheng/swift,karwa/swift,jmgc/swift,jopamer/swift,codestergit/swift,allevato/swift,russbishop/swift,jmgc/swift,deyton/swift,dduan/swift,jtbandes/swift,kentya6/swift,gottesmm/swift,nathawes/swift,IngmarStein/swift,Jnosh/swift,atrick/swift,sdulal/swift,milseman/swift,jckarter/swift,russbishop/swift,huonw/swift,roambotics/swift,return/swift,aschwaighofer/swift,calebd/swift,amraboelela/swift,apple/swift,calebd/swift,swiftix/swift,gottesmm/swift,ken0nek/swift,practicalswift/swift,lorentey/swift,felix91gr/swift,jmgc/swift,natecook1000/swift,natecook1000/swift,harlanhaskins/swift,kstaring/swift,bitjammer/swift,danielmartin/swift,hooman/swift,gmilos/swift,harlanhaskins/swift,KrishMunot/swift,cbrentharris/swift,karwa/swift,johnno1962d/swift,austinzheng/swift,dduan/swift,lorentey/swift,shajrawi/swift,tkremenek/swift,rudkx/swift,shahmishal/swift,tardieu/swift,jopamer/swift,dduan/swift,glessard/swift,ken0nek/swift,CodaFi/swift,felix91gr/swift,russbishop/swift,nathawes/swift,rudkx/swift,LeoShimonaka/swift,frootloops/swift,gribozavr/swift,codestergit/swift,tinysun212/swift-windows,therealbnut/swift,kusl/swift,karwa/swift,ken0nek/swift,OscarSwanros/swift,JaSpa/swift,glessard/swift,harlanhaskins/swift,deyton/swift,stephentyrone/swift,kperryua/swift,swiftix/swift,arvedviehweger/swift,mightydeveloper/swift,aschwaighofer/swift,calebd/swift,sschiau/swift,johnno1962d/swift,milseman/swift,kentya6/swift,harlanhaskins/swift,Jnosh/swift,jmgc/swift,dduan/swift,parkera/swift,jckarter/swift,alblue/swift,zisko/swift,austinzheng/swift,return/swift,therealbnut/swift,kusl/swift,zisko/swift,xedin/swift,emilstahl/swift,rudkx/swift,kstaring/swift,ahoppen/swift,jtbandes/swift,kperryua/swift,huonw/swift,lorentey/swift,SwiftAndroid/swift,sschiau/swift,modocache/swift,uasys/swift,rudkx/swift,hooman/swift,frootloops/swift,apple/swift,slavapestov/swift,IngmarStein/swift,gregomni/swift,ben-ng/swift,xwu/swift,emilstahl/swift,danielmartin/swift,mightydeveloper/swift,gregomni/swift,benlangmuir/swift,natecook1000/swift,roambotics/swift,KrishMunot/swift,zisko/swift,therealbnut/swift,mightydeveloper/swift,tinysun212/swift-windows,amraboelela/swift,tkremenek/swift,LeoShimonaka/swift,frootloops/swift,MukeshKumarS/Swift,CodaFi/swift,JaSpa/swift,jtbandes/swift,alblue/swift,frootloops/swift,lorentey/swift,roambotics/swift,rudkx/swift,brentdax/swift,Ivacker/swift,shajrawi/swift,Ivacker/swift,ben-ng/swift,atrick/swift,JaSpa/swift,SwiftAndroid/swift,gribozavr/swift,brentdax/swift,MukeshKumarS/Swift,emilstahl/swift,IngmarStein/swift,nathawes/swift,alblue/swift,karwa/swift,uasys/swift,dreamsxin/swift,aschwaighofer/swift,emilstahl/swift,jtbandes/swift,LeoShimonaka/swift,swiftix/swift.old,khizkhiz/swift,MukeshKumarS/Swift,OscarSwanros/swift,devincoughlin/swift,jckarter/swift,sdulal/swift,jtbandes/swift,kusl/swift,karwa/swift,stephentyrone/swift,bitjammer/swift,slavapestov/swift,swiftix/swift.old,calebd/swift,kperryua/swift,parkera/swift,uasys/swift,airspeedswift/swift,practicalswift/swift,gmilos/swift,bitjammer/swift,sdulal/swift,adrfer/swift,karwa/swift,amraboelela/swift,devincoughlin/swift,kperryua/swift,gregomni/swift,allevato/swift,slavapestov/swift,xwu/swift,MukeshKumarS/Swift,KrishMunot/swift,danielmartin/swift,shajrawi/swift,tkremenek/swift,tjw/swift,jtbandes/swift,hooman/swift,frootloops/swift,SwiftAndroid/swift,cbrentharris/swift,shajrawi/swift,MukeshKumarS/Swift,austinzheng/swift,milseman/swift,gmilos/swift,harlanhaskins/swift,amraboelela/swift,tardieu/swift,jmgc/swift,arvedviehweger/swift,shajrawi/swift,parkera/swift,arvedviehweger/swift,alblue/swift,codestergit/swift,parkera/swift,brentdax/swift,bitjammer/swift,ben-ng/swift,roambotics/swift,adrfer/swift,sschiau/swift,zisko/swift,emilstahl/swift,JGiola/swift,xedin/swift,SwiftAndroid/swift,lorentey/swift,swiftix/swift.old,jtbandes/swift,gribozavr/swift,gmilos/swift,arvedviehweger/swift,benlangmuir/swift,lorentey/swift,JGiola/swift,deyton/swift,tardieu/swift,shahmishal/swift,return/swift,xwu/swift,parkera/swift,shahmishal/swift,hooman/swift,CodaFi/swift,gribozavr/swift,JaSpa/swift,gribozavr/swift,airspeedswift/swift,stephentyrone/swift,tjw/swift,stephentyrone/swift,ben-ng/swift,tardieu/swift,gribozavr/swift,kstaring/swift,manavgabhawala/swift,parkera/swift,johnno1962d/swift,modocache/swift,CodaFi/swift,swiftix/swift.old,Ivacker/swift,SwiftAndroid/swift,Jnosh/swift,ahoppen/swift,hughbe/swift,milseman/swift,Ivacker/swift,gottesmm/swift,ben-ng/swift,tinysun212/swift-windows,therealbnut/swift,swiftix/swift,return/swift,aschwaighofer/swift,johnno1962d/swift,airspeedswift/swift,swiftix/swift.old,austinzheng/swift,hughbe/swift,cbrentharris/swift,brentdax/swift,jopamer/swift,johnno1962d/swift,austinzheng/swift,kusl/swift,dduan/swift,khizkhiz/swift,dreamsxin/swift,return/swift,gribozavr/swift,practicalswift/swift,apple/swift,adrfer/swift,tkremenek/swift,amraboelela/swift,gottesmm/swift,sschiau/swift,ken0nek/swift,practicalswift/swift,codestergit/swift,hooman/swift,uasys/swift,MukeshKumarS/Swift,natecook1000/swift,shahmishal/swift,nathawes/swift,lorentey/swift,sschiau/swift,djwbrown/swift,CodaFi/swift,cbrentharris/swift,benlangmuir/swift,IngmarStein/swift,gottesmm/swift,uasys/swift,atrick/swift,tjw/swift,huonw/swift,CodaFi/swift,danielmartin/swift,tardieu/swift,hughbe/swift,LeoShimonaka/swift,xwu/swift,ahoppen/swift,kperryua/swift